Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2005-02-02
Phys.Rev. D71 (2005) 115013
Physics
High Energy Physics
High Energy Physics - Theory
18 pages in RevTeX format. Single-column postscript version available at http://sage.hep.upenn.edu/~bnelson/singpre.ps
Scientific paper
10.1103/PhysRevD.71.115013
String theories in principle address the origin and values of the quark and lepton masses. Perhaps the small values of neutrino masses could be explained generically in string theory even if it is more difficult to calculate individual values, or perhaps some string constructions could be favored by generating small neutrino masses. We examine this issue in the context of the well-known three-family standard-like Z_3 heterotic orbifolds, where the theory is well enough known to construct the corresponding operators allowed by string selection rules, and analyze the D- and F-flatness conditions. Surprisingly, we find that a simple see-saw mechanism does not arise. It is not clear whether this is a property of this construction, or of orbifolds more generally, or of string theory itself. Extended see-saw mechanisms may be allowed; more analysis will be needed to settle that issue. We briefly speculate on their form if allowed and on the possibility of alternatives, such as small Dirac masses and triplet see-saws. The smallness of neutrino masses may be a powerful probe of string constructions in general. We also find further evidence that there are only 20 inequivalent models in this class, which affects the counting of string vacua.
Giedt Joel
Kane Gordon L.
Langacker Paul
Nelson Brent D.
No associations
LandOfFree
Massive Neutrinos and (Heterotic) String Theory does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Massive Neutrinos and (Heterotic) String Theory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Massive Neutrinos and (Heterotic) String Theory will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-177300